挤压陡倾千枚岩地层小净距隧道大变形研究

doi:10.13722/j.cnki.jrme.2018.0998

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Abstract In order to find out the large deformation mechanism of tunnels with small intervals through squeezing soft rock stratum and to propose the control technology of large deformation of surrounding rocks，the influencing factors，the deformation law of the surrounding rock and the mechanical characteristics of the lining structure were studied by theoretical analysis，numerical calculation and field test. Results show that the large deformation of the tunnel is resulted from the coupling effect of multiple factors such as high geostress，steeply dipping strata，low surrounding rock strength and approaching construction. The unloading disturbances of the rear tunnel exerts a bias load to the preceding tunnel on one hand，and on the other hand，results in the bending damage of the surrounding rock of the preceding tunnel near the central rock pillar suffers outwards the tunnel，including the decrease of the displacement of the preceding tunnel's side wall near the central rock pillar，the transformation of the force state of the initial support in the arch and the increase of the tensile stress of the secondary lining in the arch and the inverted arch. According to the surrounding rock?s deformation and the support force condition，the small interval tunnel is divided by the influence degree of proximity construction，which can be used as the basis for the dynamic adjustment of the control measures and the engineering analogy. The construction process should be controlled strictly to avoid the secondary lining?s end of the preceding tunnel lying behind the excavation working face of the rear tunnel，and other measures such as adjusting the shape of the tunnel section according to the stress distribution characteristics，changing the bolt angle according to the characteristics of the rock mass and protecting the central rock pillar according to the proximity disturbance condition should also be taken into account.

Key words： tunnelling engineering high geostress steeply dipping strata chlorite phyllite tunnels with small intervals large deformation control technology

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	Articles by authors
	LI Lei1
	TAN Zhongsheng2
	GUO Xiaolong2
	YU Yu3
	LUO Ningning4

Cite this article:

LI Lei1,TAN Zhongsheng2,GUO Xiaolong2, et al. Research on large deformation of tunnels with small intervals in squeezing steeply dipping phyllite strata[J]. , 2019, 38(2): 276-286.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2018.0998 OR http://www.rockmech.org/EN/Y2019/V38/I2/276

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